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Standard Notation and Expansion of Numbers

Simplify the ...

Question

Simplify the following:
12 × 105

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Solution

12 × 105 = (10 + 2) × 105
= 10 × 105 + 2 × 105
= 10 × (100 + 5) + 2 × (100 + 5)
= 1000 + 50 + 200 + 10
= 1260

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